21375061505073 has 12 divisors (see below), whose sum is σ = 30875149047808. Its totient is φ = 14250013215480.

The previous prime is 21375061505041. The next prime is 21375061505117. The reversal of 21375061505073 is 37050516057312.

21375061505073 is a `hidden beast` number, since 2 + 1 + 3 + 75 + 0 + 6 + 1 + 505 + 0 + 73 = 666.

It is not a de Polignac number, because 21375061505073 - 2⁵ = 21375061505041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21375061505003) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3263568 + ... + 7307598.

Almost surely, 2^{21375061505073} is an apocalyptic number.

It is an amenable number.

21375061505073 is a deficient number, since it is larger than the sum of its proper divisors (9500087542735).

21375061505073 is a wasteful number, since it uses less digits than its factorization.

21375061505073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4631324 (or 4631321 counting only the distinct ones).

The product of its (nonzero) digits is 661500, while the sum is 45.

The spelling of 21375061505073 in words is "twenty-one trillion, three hundred seventy-five billion, sixty-one million, five hundred five thousand, seventy-three".